Tengen Toppa Lagann (天元突破ラガン Tengen Toppa Ragan, literally "Heaven-Piercing Lagann") is Simon's Tengen Toppa Gunmen formed during the final battle with the Granzeboma in the second movie adaptation of the series, The Lights in the Sky are Stars. It is the head-unit of Tengen Toppa Gurren Lagann, which is broken off when the premiere Tengen Toppa Gunmen is destroyed. It is later repaired when it is used with the other Tengen Toppa Gunmen to form Super Tengen Toppa Gurren Lagann.
Tengen Toppa Lagann is based directly on Lagann, having been simply a larger version of it. However, it retains the detailed helmet of Tengen Toppa Gurren Lagann, as well as smaller versions of the latter's shoulder pads. It is the only one of the Tengen Toppa Gunmen made from a piece of Tengen Toppa Gurren Lagann, and appears after the ten other Tengen Toppa Gunmen.
In The Lights in the Sky are Stars
Tengen Toppa Lagann is saved by Nia Teppelin's Tengen Toppa Solvernia as she prevents the Granzeboma from drilling through it. The mecha is not seen again until after the rest of Team Super Galaxy Dai-Gurren appears, and is the one that blocks the Infinity Big Bang Storm. It then absorbs the blast's energy when Lordgenome sacrifices himself, using it and the rest of the team's Tengen Toppa Gunmen to form Super Tengen Toppa Gurren Lagann.
Tengen Toppa Lagann has the ability to form drills on itself just as Lagann does.