Avogadro

Cornelius Pernell also known as Avogadro is a minor enemy in Call of Duty: Black Ops 2 and the main villain in the zombies mode of Call of Duty: Black Ops 4. He was a former World War 2 handler to Peter McCain and former Operator Director of the Broken Arrow project.

He becomes one of the many Demonic Announcers that control the Zombies during the Alpha Omega level in Nuketown after an accident that caused him to be trapped inside the A.P.D. machine.

He was voiced by Tom Kane, who also played as Brutus in Call of Duty: Black Ops 4.

World War 2
Cornelius Pernell was an OSS soldier during World War 2. He was a scientist and handler for Peter McCain in order to infiltrate Group 935 in Munich. They conducted experiments with Element 115 but was starting to lose funding for the research. He and McCain hired Marine Recon Team to the Der Riese facility. This plan ultimately failed as they were revealed and captured by Group 935.

Two of the Recon Teams ended up dying and the other two were captured and taken by Dr. Edward Richtofen. Due to this, Cornelius attempted to call Peter at the Rendezvous under Division 9 but failed to get a response. It wasn't until a month later that it was discovered that Peter had died in his Parachute over the Rising Sun facility.

Broken Arrow
After the war, he joined with CIA in Groom Lake of Nevada where he researched Element 115 that was recently discovered in 1937 at the time. During this time, he conducted experiments on teleportation to the CIA facility to another facility on the Moon called Griffin Station during 1961. In 1962, he started the construction of the American Pyramid Device at a nuclear testing site in Groom Lake.

In 1963, he became aware of Lugwig Maxis' daughter, Samantha Maxis due to Dr. Schuster. Due to this knowledge, he ended up working on experiments with Element 115 to stop Samantha's vengeful zombie attack on Richtofen which resulted in him funding Project Broken Arrow. In 1964, he used the Elemental Shard to resurrect Peter McCain.

Avogadro
In Feburary 1965, he was subjected to phase II of the MKAlpha experiments involving A.P.D. device. He interrogated Yuri Zavoyski but this led into Cornelius brutally killing her in the process but not before finding out about the Aether and Agartha. This led to an obsession with finding out about the Agartha along with him starting to hear voices due to the amount of radiation coming from Element 115.

By 1966, he began having lucid dreams about the elemental shards. One of them predicting 1968. Two years later on March 15, he was raided by George Sawyer and his men