Joe used the pseudonym "Peter Henderson" – a fictional Soviet Union-era spy in several Tom Clancy novels who infiltrated the US government, emails show.

Nypost.com reports: The messages contained on Hunter's abandoned laptop appear to indicate the then-VP started using the fictitious mole's moniker in October 2016 while forwarding a YouTube video to his son Hunter, brother Jim, daughter-in-law Hallie, as well as his sister and longtime political strategist Valerie Biden Owens.

Biden sent the message using an email address with a username of "67stingray" — a clear reference to his beloved 1967 Corvette Stingray.

The name attached to Biden's "67stingray" account at the time was "Peter Henderson" – which matches the name of the KGB spy in Clancy's popular Jack Ryan series, according to online fan pages.

Henderson, whose codename was Cassius in Clancy's realm, worked as a "minor Senate aide" in 1970 before becoming a Russian spy who was later caught by the CIA and turned into a double agent.

He was then freed due to "deep knowledge of secret information on the Soviet Union," according to an authoritative Jack Ryan fan site. The character appeared in four Clancy novels, including "The Hunt for Red October."

Weeks later, Biden appeared to still be using the mysterious alias in November 2016 while forwarding a Forbes story about how demographic trends "spell trouble" for China and Russia, but indicate "prosperity" ahead in the US.

The message was sent from Biden's "67stingray" account, the email shows.

The account then sent a short yet emotional message to Hunter Biden on Jan. 3, 2017, just weeks before Biden left the White House after eight years as vice president in Barack Obama's administration.

"Keep in touch," the message sent from an iPhone read. "Love Dad."

The White House didn't respond to an inquiry by The Post Friday about the Peter Henderson alias. The connection was first noted by The National Pulse in October 2020.