In the final episode of Agents of S.H.I.E.L.D.: Double Agent, the Mastermind is finally revealed, and a sneak peek at the two-hour season finale is revealed.

Here is the description for this episode:

There is a double agent on the set of Marvel’s Agents of S.H.I.E.L.D. Reporting to a shadowy Mastermind, he evades security and gathers classified information for the legions of fans who are always eager for the next exciting bit of Marvel news. On the run with a stolen copy of the Marvel’s Agents of S.H.I.E.L.D. finale, the Double Agent finds himself in a desperate car chase with Marvel Security. The Mastermind’s true identity is revealed and our adventure culminates in a startling conclusion. Special appearance by Clark Gregg (Director Coulson).

As expected, the Mastermind on the Double Agent series was revealed to be none other than Stan Lee, who was playing Lee’s evil clone, Lan Stee!

Here are a few screenshots from the video:

The season two two-hour finale of Agents of S.H.I.E.L.D. will air on May 12th, the same day as ABC’s upfronts. We should hear about the show’s renewal – as well as the fate of Agent Carter – that Tuesday.

Source: ABC.