Infiltration into East Berlin

The Infiltration into East Berlin was a mission undertaken by the Hank Pym Ant-Man to stop a group of radicals who had got hold of HYDRA technology.

Background
Peggy Carter and Howard Stark send Pym on a mission to retrieve some HYDRA technology that has fallen into the hand of some dangerous radicals.

Hank uses the Ant-Man Suit to shrink down and get through the Berlin Wall. At his shrunken size, he encounters a vicious guard dog while attempting to cross the "death strip" of the Berlin Wall, and detonates a "German antipersonnel device" in order to escape. On the other side of the Wall, Pym follows the coordinates that Stark gave to him, and he soon comes across a wasp, which he uses as for transportation.

Battle
He soon locates the radicals' base of operation, easily bypassing a pair of guards to enter a room and return to his normal size. He discovers plans for "some of HYDRA's old memory suppression experiments" before hearing screams which he follows to find a room containing a functioning machine with a man loaded inside, screaming in agony. A HYDRA agent orders the test stopped and asks the subject if he is ready for duty. The man responds that he is, announcing his loyalty to HYDRA. Moments later, the man begins to regain his memory and screams for help, and the HYDRA agent orders for the man's mind to be wiped again.

Pym shrinks again and enters the room, using his tiny size to psychologically torment the HYDRA agent before beginning to destroy the machinery. He then frees the test subject and distracts the HYDRA agents before momentarily returning to normal size and attacking them. He then shrinks again and flees on the wasp as additional HYDRA agents arrive.

Aftermath
Back at the S.H.I.E.L.D. Research & Development Lab, Pym explains that he destroyed the plans for the memory suppression technology, and Stark insists that the Berlin operation was Pym's last field assignment. Pym disagrees, however, insisting that "there's important work to be done in the field that only the Particle can handle," and that "the only way S.H.I.E.L.D. gets the Pym Particle is with a Pym operating it."