[1] In 2005, Theobald graduated to the German Formula Three Championship, racing in the same SMS Seyffarth Junior Team as his brother Julian.

[2] Theobald remained in the series for 2006, but due to budget constraints he competed in the secondary Trophy Class for older specification Dallara chassis.

Despite again missing a round of the championship at the Lausitzring, he accumulated three class wins and a further eleven podium places to finish as runner–up behind Latvian Harald Schlegelmilch.

In October 2007, Theobald replaced Alessandro Ciompi at Eurointernational for the penultimate round of the Formula Renault 3.5 Series season in Estoril, lining up alongside his brother Julian in the team.

[6] Whilst Julian took part in the Brands Hatch meeting, Johannes was unable to compete due to him undergoing his final university exams back in Germany.