\tableofcontents


it is shown in at the top of the presentation, like in the following picture:

Is it possible to prevent the contents from appearing at the top, but only at the one frame where \tableofcontents command is used at the beginning?

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You can clean up the headline by providing an empty template declaration: I am guessing that you are using Warsaw theme (since you did not provide any MWE)

\documentclass{beamer}
\usetheme{Warsaw}
\title{Evolution and invasion}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\frame{\tableofcontents}
\section{Introduction}
\section{Webworld}
\section{Results}
\subsection{As the web grows}
\begin{frame}{As the web grows}{Generalizations}
Frame 1
\end{frame}
\subsection{it frightens me}
\frame{2}
\subsection{I like trains!}
\frame{3}
\section{Summary}
\end{document}


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